AST RESEARCH, INC.
==================

   ADVANTAGE! PLUS SERIES 486 (MYLEX) (202529-000, 006)

   Processor    80486SX/80487SX/ODP486/ODPR486/80486DX/80486DX2   
   Processor    25/33/50(internal)/66(internal)MHz                
   Speed        
   Chip Set     Unidentified                                      
   Max. Onboard 32MB                                              
   DRAM         
   Cache        64/256KB                                          
   BIOS         AMI                                               
   Dimensions   330mm x 218mm                                     
   I/O Options  Floppy drive interface, IDE interface, parallel   
                port, serial ports (2)                            
   NPU Options  None                                              

<gopher://bitreich.org/I/th99/m/A-B/33243-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | Parallel port     |    J1    | Turbo LED        |   JP3    |
   |-------------------+----------+------------------+----------|
   | Serial port 2     |    J2    | Reset switch     |   JP4    |
   |-------------------+----------+------------------+----------|
   | Serial port 1     |    J3    | Speaker          |   JP5    |
   |-------------------+----------+------------------+----------|
   | Floppy drive      |    J4    | IDE interface    |   JP6    |
   | interface         |          | LED              |          |
   |-------------------+----------+------------------+----------|
   | IDE interface     |    J5    | External battery |   JP22   |
   |-------------------+----------+------------------+----------|
   | Power LED &       |   JP2    |                  |          |
   | keylock           |          |                  |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               | Jumper |  Position  |
   |--------------------------------------+--------+------------|
   |>> | Monitor type select color        |  JP1   |   Closed   |
   |---+----------------------------------+--------+------------|
   |   | Monitor type select monochrome   |  JP1   |    Open    |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP18  |    Open    |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Parallel port IRQ select IRQ7    |  JP19  | Pins 2 & 3 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | Parallel port IRQ select IRQ5    |  JP19  | Pins 1 & 2 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |>> | On board I/O enabled             |  JP20  | Pins 1 & 2 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | On board I/O disabled            |  JP20  | Pins 2 & 3 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |>> | Battery type select internal     |  JP21  | Pins 2 & 3 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | Battery type select external     |  JP21  |    Open    |
   |---+----------------------------------+--------+------------|
   |   | CMOS memory clear                |  JP21  | Pins 1 & 2 |
   |   |                                  |        |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |       Size       |       Bank 0       |       Bank 1       |
   |------------------+--------------------+--------------------|
   |       1MB        |    (4) 256K x 9    |        None        |
   |------------------+--------------------+--------------------|
   |       2MB        |    (4) 256K x 9    |    (4) 256K x 9    |
   |------------------+--------------------+--------------------|
   |       4MB        |     (4) 1M x 9     |        None        |
   |------------------+--------------------+--------------------|
   |       5MB        |     (4) 1M x 9     |    (4) 256K x 9    |
   |------------------+--------------------+--------------------|
   |       8MB        |     (4) 1M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       16MB       |     (4) 4M x 9     |        None        |
   |------------------+--------------------+--------------------|
   |       20MB       |     (4) 4M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   |    Size    |    Bank 0     |     TAG0      |     TAG1      |
   |------------+---------------+---------------+---------------|
   |    64KB    |  (8) 8K x 8   |  (1) 64K x 1  |  (1) 8K x 8   |
   |------------+---------------+---------------+---------------|
   |   256KB    |  (8) 32K x 8  |  (1) 64K x 1  |  (1) 32K x 8  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   |   Size    |    JP7     |    JP11    |   JP12   |   JP13    |
   |-----------+------------+------------+----------+-----------|
   |   None    |    Open    |    Open    |   Open   |   Open    |
   |-----------+------------+------------+----------+-----------|
   |   64KB    |    Open    |    Open    |   Open   |   Open    |
   |-----------+------------+------------+----------+-----------|
   |   256KB   |   Closed   |   Closed   |   Open   |  Closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |   Type    |        JP8        |        JP9        |  JP10  |
   |-----------+-------------------+-------------------+--------|
   |  80486SX  |       Open        | Pins 2 & 3 closed |  Open  |
   |-----------+-------------------+-------------------+--------|
   |  80487SX  | Pins 2 & 3 closed | Pins 1 & 2 closed | Closed |
   |-----------+-------------------+-------------------+--------|
   |  odp486   | Pins 2 & 3 closed | Pins 1 & 2 closed | Closed |
   |-----------+-------------------+-------------------+--------|
   |  odpR486  | Pins 1 & 2 closed | Pins 1 & 2 closed | Closed |
   |-----------+-------------------+-------------------+--------|
   |  80486DX  | Pins 1 & 2 closed | Pins 1 & 2 closed | Closed |
   |-----------+-------------------+-------------------+--------|
   | 80486DX2  | Pins 1 & 2 closed | Pins 1 & 2 closed | Closed |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   | Speed  |    JP14    |    JP15    |    JP16    |    JP17    |
   |--------+------------+------------+------------+------------|
   | 25MHz  | Pins 2 & 3 | Pins 2 & 3 | Pins 1 & 2 | Pins 2 & 3 |
   |        |   closed   |   closed   |   closed   |   closed   |
   |--------+------------+------------+------------+------------|
   | 33MHz  | Pins 2 & 3 | Pins 1 & 2 | Pins 1 & 2 | Pins 2 & 3 |
   |        |   closed   |   closed   |   closed   |   closed   |
   |--------+------------+------------+------------+------------|
   | 50iMHz | Pins 2 & 3 | Pins 2 & 3 | Pins 1 & 2 | Pins 2 & 3 |
   |        |   closed   |   closed   |   closed   |   closed   |
   |--------+------------+------------+------------+------------|
   | 66iMHz | Pins 2 & 3 | Pins 1 & 2 | Pins 1 & 2 | Pins 2 & 3 |
   |        |   closed   |   closed   |   closed   |   closed   |
   +------------------------------------------------------------+